Nothing
The size of the body irradiated may be derived from $f$ after a correction for the effects of interphase death and mitotic delay.
This correction needs to indicate a $D_0$ value from the literature, between $2.7$ and $3.5$, or a gamma coefficient obtained from own experimental data.
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.